This standard outlines the specifications regarding the size, materials, and quality criteria for metal fittings utilized in the manufacture of plywood tea chests in India. It is intended for manufacturers, inspectors, and engineers to ensure the proper durability and uniformity of the fittings used in tea chest assembly.
Overview
This standard outlines the specifications regarding the size, materials, and quality criteria for metal fittings utilized in the manufacture of plywood tea chests in India. It is intended for manufacturers, inspectors, and engineers to ensure the proper durability and uniformity of the fittings used in tea chest assembly.
Audience
Contents
Structure
This section defines the sampling procedures, acceptance criteria, and marking requirements for metal fittings used in plywood tea chests. It includes detailed tables outlining sample sizes and permissible defectives based on lot quantity, as well as dimensional specifications for various tea chest sizes with designated V-notch locations and tolerances.
Describes the required materials for the metal fittings—specifically waste-quality tinplate or terne plate—and specifies minimum thickness values. It includes tables listing the lengths of corner and top/bottom fittings corresponding to different tea chest dimensions, with emphasis on quality testing of sample batches.
Details the exact measurements and tolerance limits for metal fittings, including length and positioning of V-notches. It specifies inspection methods on sample pieces and highlights the importance of maintaining dimensional accuracy for proper assembly.
Focuses on the design features such as the use of beaded edges, smooth rust-free surfaces, and appropriate notch placements to ensure strength and ease of assembly. It also reiterates material quality and dimensional tolerances.
Outlines the process for lot-wise testing of metal fitting batches using statistically valid random sampling as per IS 4905:1968. It includes detailed sampling scales and acceptance criteria based on lot sizes.
Specifies the requirement for each metal fitting to be marked with the manufacturer's identification to ensure traceability. It also describes the use of the BIS Standard Mark under licensing and quality supervision.
Provides additional details on sampling locations and procedures for fittings, emphasizing the uniform length of 257.5 mm for standard sizes and the necessity of dimensional conformity to maintain quality.
Presents a comprehensive table correlating tea chest dimensions with required lengths of corner and top/bottom metal fittings, including V-notch positions and dimensional tolerances.
Details the sample sizes and the maximum allowable defective fittings per lot size for quality conformity, reinforcing the random sampling methodology and criteria for lot acceptance or rejection.
Frequently Asked
IS 10 Part 4 (1989) specifies that metal fittings for plywood tea chests must be made from either waste-quality tinplate or terne plate, which is a steel sheet coated with a lead-tin alloy. The standard mandates a minimum thickness requirement without specifying a range, ensuring the fittings are durable and corrosion-resistant for packaging use.
The fittings must be fabricated from tinplate or terne plate that is smooth, clean, and free from rust as per Clause 3.1. While the standard specifies only a minimum thickness (exact values referenced in full text), typical industry thicknesses range around 0.28 to 0.35 mm. Dimensional tolerances allow a variation of plus or minus 3 mm for lengths of corner and top/bottom fittings, ensuring proper fit and assembly.
Sampling is performed lot-wise with each lot tested independently. The sample size and allowable defective fittings depend on the lot size as outlined in the standard's sampling table. Random sampling methods follow the IS 4905:1968 guidelines. If the number of defective items in the sample is within permissible limits, the lot is accepted; otherwise, it is rejected or subjected to re-inspection.
Each metal fitting must be permanently marked with the manufacturer's identification to ensure traceability and quality control. The use of the BIS Standard Mark is controlled under the BIS Act and requires licensing, indicating compliance with Indian quality standards and continuous oversight.
Yes, for tea chests measuring 380 mm × 685 mm × 845 mm, used specifically for instant tea packaging, the metal fittings have unique dimensions. Corners (4 pieces) are flat with beaded edges, 844 mm long; top and bottom fittings (8 pieces) include four pieces at 686 mm and four pieces at 380 mm lengths. Straight-ended fittings are allowed for this size, differing from the standard beaded or V-notched ends.
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